Display device

Abstract

To provide a display device with excellent display quality, in a display device including a signal line, a scan line, a transistor, a pixel electrode, and a common electrode in a pixel, the common electrode is included in which an extending direction of a region overlapping with the signal line differs from an extending direction of a region overlapping with the pixel electrode in a planar shape and the extending directions intersect with each other between the signal line and the pixel electrode. Thus, a change in transmittance of the pixel can be suppressed; accordingly, flickers can be reduced.

The invention claimed is: 
     
       1. A display device having a plurality of pixels, at least one of the plurality of pixels comprising:
 a transistor; 
 a pixel electrode; 
 a first insulating layer over the transistor and the pixel electrode, the first insulating layer having an opening through which part of the pixel electrode is exposed; 
 a second insulating layer on the first insulating layer and the part of the pixel electrode; and 
 a common electrode over the pixel electrode, 
 wherein the transistor is electrically connected to a signal line, a scan line, and the pixel electrode, 
 wherein the common electrode comprises: 
 a plurality of first regions provided parallel to each other, each of the plurality of first regions having a stripe pattern including a first bent portion and a second bent portion; 
 a second region being connected to ends of the plurality of first regions; and 
 a third region intersecting with the scan line and being connected to a common electrode in an adjacent pixel, and 
 wherein the third region does not overlap with the signal line. 
 
     
     
       2. The display device according to  claim 1 , wherein the transistor comprises a gate electrode, a gate insulating film over the gate electrode, and a semiconductor layer over the gate insulating film. 
     
     
       3. The display device according to  claim 1 , wherein extending directions of the plurality of first regions and an extending direction of the signal line make, a first angle. 
     
     
       4. The display device according to  claim 1 , wherein extending directions of the second region and the third region are parallel to the extending direction of the signal line. 
     
     
       5. The display device according to  claim 1 , wherein a channel formation region of the transistor comprises an oxide semiconductor. 
     
     
       6. The display device according to  claim 1 , further comprising a liquid crystal layer over the pixel electrode and the common electrode. 
     
     
       7. A display device having a plurality of pixels, at least one of the plurality of pixels comprising:
 a transistor; 
 a pixel electrode; 
 a first insulating layer over the transistor and the pixel electrode, the first insulating layer having an opening through which part of the pixel electrode is exposed; 
 a second insulating layer on the first insulating layer and the part of the pixel electrode; and 
 a common electrode over the pixel electrode, 
 wherein the transistor is electrically connected to a signal line, a scan line, and the pixel electrode, 
 wherein the common electrode comprises: 
 a first end portion being parallel to the scan line; 
 a second end portion being adjacent to the first end portion, the second end portion being parallel to the signal line; 
 a third end portion facing to the first end portion; 
 a plurality of slits provided between the first end portion and the third end portion, each of the plurality of slits having a stripe pattern including a first bent portion and a second bent portion; and 
 a connection portion intersecting with the scan line and being connected to the first end portion of the common electrode and a third end portion of a common electrode in an adjacent pixel, 
 wherein the second end portion is adjacent to end portions of the plurality of slits, and 
 wherein the connection portion does not overlap with the signal line. 
 
     
     
       8. The display device according to  claim 7 , wherein the transistor comprises a gate electrode, a gate insulating film over the gate electrode, and a semiconductor layer over the gate insulating film. 
     
     
       9. The display device according to  claim 7 , wherein the common electrode further comprises a region between adjacent two of the plurality of slits, the region having zigzag stripe shape and extending in a direction parallel to the plurality of slits. 
     
     
       10. The display device according to  claim 7 , wherein an extending direction of the connection portion of the common electrode is parallel to an extending direction of the signal line. 
     
     
       11. The display device according to  claim 7 , wherein a channel formation region of the transistor comprises an oxide semiconductor. 
     
     
       12. The display device according to  claim 7 , further comprising a liquid crystal layer over the pixel electrode and the common electrode.